public static Assign CreateAssign(CodeElement elem, Scope scope)
{
// assign = identifier '=' exp ';';
var cmd = new Assign();
CodeElement idElem = elem.Codes(WordIdentifier).First();
cmd.VariableName = idElem.Value;
cmd.VariableType = scope.ExistsVariable(cmd.VariableName, idElem);
CodeElement expCode = elem.Codes().Last();
cmd.Expression = ExpressionBuilder.CreateExpression(expCode, scope);
if (cmd.VariableType == DefType.Bool && !ExpBase.IsBool(cmd.Expression))
{
throw new Exception(string.Format("The expression must be a bool'. {0}", expCode.GetLineAndColumn()));
}
if (cmd.VariableType == DefType.Int && !ExpBase.IsInt(cmd.Expression))
{
throw new Exception(string.Format("The expression must be an integer'. {0}", expCode.GetLineAndColumn()));
}
if (cmd.VariableType == DefType.Float && !ExpBase.IsNumber(cmd.Expression))
{
throw new Exception(string.Format("The expression must be a number'. {0}", expCode.GetLineAndColumn()));
}
return(cmd);
}
public static Return CreateReturn(CodeElement elem, Scope scope, DefType resultType)
{
// return = 'return' [exp] ';';
var cmd = new Return();
CodeElement expCode = elem.Codes().FirstOrDefault();
if (expCode != null)
{
cmd.Expression = ExpressionBuilder.CreateExpression(expCode, scope);
if (resultType == DefType.Bool && !ExpBase.IsBool(cmd.Expression))
{
throw new Exception(string.Format("The expression must be a bool'. {0}", expCode.GetLineAndColumn()));
}
if (resultType == DefType.Int && !ExpBase.IsInt(cmd.Expression))
{
throw new Exception(string.Format("The expression must be an integer'. {0}", expCode.GetLineAndColumn()));
}
if (resultType == DefType.Float && !ExpBase.IsNumber(cmd.Expression))
{
throw new Exception(string.Format("The expression must be a number'. {0}", expCode.GetLineAndColumn()));
}
}
else
if (resultType != DefType.Void)
{
throw new Exception(string.Format("This function must return a value. {0}", elem.GetLineAndColumn()));
}
return(cmd);
}
public static VariableDef CreateVariableDef(CodeElement elem, Scope scope)
{
// variableDef = typeAndId '=' exp ';';
var def = CreateDeclare(elem.Codes(WordDeclare).First(), true);
var cmd = new VariableDef()
{
Name = def.TheName, VariableType = def.TheType
};
if (elem.Codes().Count() == 2)
{
CodeElement expCode = elem.Codes().Last();
cmd.Expression = ExpressionBuilder.CreateExpression(expCode, scope);
if (cmd.VariableType == DefType.Bool && !ExpBase.IsBool(cmd.Expression))
{
throw new Exception(string.Format("The expression must be a bool'. {0}", expCode.GetLineAndColumn()));
}
if (cmd.VariableType == DefType.Int && !ExpBase.IsInt(cmd.Expression))
{
throw new Exception(string.Format("The expression must be an integer'. {0}", expCode.GetLineAndColumn()));
}
if (cmd.VariableType == DefType.Float && !ExpBase.IsNumber(cmd.Expression))
{
throw new Exception(string.Format("The expression must be a number'. {0}", expCode.GetLineAndColumn()));
}
}
if (scope.ExistsFunction(cmd.Name))
{
throw new Exception(string.Format("A Function called '{0}', {1}, is declared", cmd.Name, elem.GetLineAndColumn()));
}
scope.Vars.BuildVariable(cmd.VariableType, cmd.Name, elem);
return(cmd);
}